NASA’s New Horizons spacecraft zipped past Jupiter and caught this image of Io, the planet’s third-largest moon, as a volcano was erupting on the surface. The plume emanating from the Tvashtar volcano is 200 miles high.

Locked in a perpetual tug of war between the imposing gravity of Jupiter and the smaller, consistent pulls of its neighboring moons, Io’s distorted orbit causes it to flex as it swoops around the gas giant. The stretching causes friction and intense heat in Io’s interior, sparking massive eruptions across its surface. ...more including a gif animation of the explosion